Question

Actinium 231, ²³¹ AC₈₉, emit in succession two β particles,
four α-particles, one β and one α plus several γ rays. What
is the resultant isotope?
(a) ²²¹ Au₇₉ (b) ²¹¹ Au ₇₉
(c) ²²¹ Pb ₈₂ (d) ²¹¹ Pb ₈₂

Answer 1

$<marquee direction="up">!!!!!!!</marquee>$Actinium 231, ²³¹ AC₈₉, emit in succession two β particles,

four α-particles, one β and one α plus several γ rays. What

is the resultant isotope?

(a) ²²¹ Au₇₉ (b) ²¹¹ Au ₇₉

(c) ²²¹ Pb ₈₂ (d) ²¹¹ Pb ₈₂